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The definitive way to test this is to configure imagemagick and see if you can manipulate a tif image
Obviously your host is having issues because if Imagemagick is installed correctly with tif support it will work with tif images. I know I have installed Imagemagick many times. If tif image support does not work within the program it is not configured to do tif's
Not much I can do to help here other than point to the Imagemagick installation instructions. This is a server level program like PHP and is one of the requirements to operate the program. If Imagemagick does not work you need to use GD2 or in your case since it works for gif png and jpg images just remove tif as an allowable image type in upload options
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